<div id="app">
  <ul>
    <li v-for="item in arr">{{item}}</li>
  </ul>
</div>
<!-- <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script> -->
<script src="./vue.js"></script>
<script>
  new Vue({
    el: "#app", 
    data: {
      arr: ["春天", "夏天", "秋天", "冬天"] 
    }
  })
</script>